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An Introduction to Kotlin

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Android development is performed primarily using Android Studio which is, in turn, based on the IntelliJ IDEA development environment created by a company named JetBrains. Prior to the release of Android Studio 3.0, all Android apps were written using Android Studio and the Java programming language (with some occasional C++ code when needed).
The panel on the left-hand side (marked A in Figure 11-1) contains a list of coding examples together with any examples you create. Code is typed into the main panel (B) and executed by clicking the Run button (C). Any output from the code execution appears in the console panel (D). Arguments may be passed through to the main function by entering them into the field marked E.
[[image:kotlin_playground.png]]
Try out some Kotlin code by opening a browser window, navigating to the online playground and entering the following into the main code panel: